Add ergonomic multi-queue device creation

[antono3]

Summary

• add validated per-family queue requests with per-queue priorities
• expose every created borrowed queue while preserving Device.queue compatibility
• create command pools for any queue borrowed from the device
• fix legacy nonzero queue selection so every index through the selected queue is actually created
• exercise legacy and multi-queue paths under Vulkan validation

The convenience layer intentionally creates ordinary queues with zero VkDeviceQueueCreateFlags; protected or otherwise flagged queue configurations remain available through the raw API.

Validation

• V 0.5.2: v -cc gcc test ergonomic
• V 0.5.2: validation-layer examples/ergonomic_lifecycle on NVIDIA GeForce GTX 1060 6GB (2 queues)
• current V: v -cc gcc test ergonomic
• current V: validation-layer examples/ergonomic_lifecycle on NVIDIA GeForce GTX 1060 6GB (2 queues)
• V 0.5.2 and current V: generated-binding smoke probe
• no changes to generated vulkan.v or vulkan_video.v